Pumnp



D A. GARDEN.

Patented Apr. 13, 1920.

Var/4 attoznm s,

DAVID A. GARDEN,

OF HOUSTON, TEXAS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

INTERSTATE OIL AND EQUIPMENT CORPORATION, A CORPORATION OF DELA- WARE.

PUMP.

Application filed February 10, 1919.

To all whom it may concern:

Be it known that I, DAVID A. GARDEN, a citizen of the United States, residin at Houston, in the. county of Harris and tate of Texas, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

This invention relates to new and useful improvements in a pump. I

One object of the invention is to provide a pump of the character described, which is specially adapted for use in wells, particularly oil wells, whereby the air will be exhausted from the well and a vacuum created therein, and whereby the fluid may also be at the same time pumped from the well. In operating oil wells, it is often necessary to exhaust the air as far as possible from the well to create a vacuum therein, said vacuum accelerating the inflow of oil from the surrounding strata into the screen. It is the object of this invention to provide a device of the character described, which will create said vacuum in combination with a pump, which will lift the oil that flows into the screen and discharge the same to the surface of the ground.

Another object of the invention is to pro- 'vide a device of the character described which may be easily let down into and withdrawn from the well casing.

\Vith the above and other objects in view, the invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

The figure shows a vertical sectional view of the device.

Referring now more particularly to the drawing, 1'! numeral 1 refers to a casing, which is let down into the bore, and the numeral 2, refers to the well screen. which is attached to the lower end of the casing, by means of a collar 3. and which is set in the oil bearing strata of the bore. Fitted within the'upper end of the casing, is a barrel 4, whose upper end has the annular flange 5, which rests upon the top of the casing.

The upper end of this barrel is closed by means of a disk-like covering 6, having the central opening 7, and secured to the upper end of the casing, is the casing head 8, with in which the disk 6 is secured by means of Specification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 276,164.

suitable set bolts as 9. The lower end of the barrel 4 is formed into a seat 10, having the central stufling box 11, and provided with the usual lift valves 12, 12. Within the barrel 4, is a plunger 13, provided with lift valves 14, 14, and this plunger is reciprocated in the valve by means of the tubular stem 15, which is attached to the plunger, and this stem operates through the opening 7, and continues on down through the stuffing box 11, of the seat 10. Within the screen, there is a working barrel 16, whose upper end is closed by the cap 17, which is threaded thereon, and which is provided with a central bearing through which the stem 15 extends. There is attached to the lower end of the working barrel 16, a perforated pipe section 18, which rests on the bottom of the bore. This attachment is made by means of the connection 19, into which the lower end of the barrel 16, and the upper end of the pipe section 18, respectively, are threaded, and the connection 19 is formed with a valve seat 20, which is controlled by the ball valve 21, held in place by means of the cage 22. A plunger 23 is attached to the lower end of the stem 15. and is reciprocated thereby. up and down in the working barrel 16. This plunger has the lengthwise passageway 24 therethrough. which is alined with the stem 15. and whose upper and lower ends are controlled by the respective ball valves 25, and 26. The barrel 16 is held in fixed position in the screen by means of strong flexible arms 27, whose upper ends are attached to the cap 17, and whose lower ends are free, said-arms curv ing outwardly, and frictionally engaging the screen. The stem 15 is manipulated up and down by means of any well known device, such as the walking beam, commonly employed for operating pumps of this char acter, whereby the plunger 13 is manipulated up and down and exhausts the air from the bore, said air being forced out through the opening 7 The vacuum thus created in the bore facilitates the inflow of oil from the surrounding strata in the screen. The stem 15 at the same time reciprocates the plunger 23, up and down in the barrel 16, thereby pumping out the oil which is forced up through said stem to the surface of the ground.

The entire device may be readily removed from the casing by unscrewing the set bolts 9, and then pulling the same out by means of the stem 15,

What I claimis:

l. A device of the character described, including a casing, a barrel fitted in the upper end thereof, whose lower end is formed into a seat, a valve controlling said seat, a plunger in said barrel provided with a fluid passageway, a valve controlling said passageway, a second barrel fixed in said casing below the barrel first mentioned, means carried by said second barrel and frictionally engaging the casing, a valve seat provided at the lower end thereof, a valve controlling said seat, a plunger in said last mentioned barrel, having a fluid passageway therethrough, a valve controlling said passageway, a tubular stem to which said plungers are attached and by means of which they may be simultaneously reciprocated, and a perforated pipe attached to and depending from the lower barrel.

2. The combination with a casing adapted to be let down into a well bore, of a barrel fitted in the upper end thereof, and provided with a seat, a plunger in said barrel, fluid controlling valves carried by said plunger and seat respectively, a second barrel in the casing, below the barrel first mentioned, provided with a seat, flexible arms secured to said second barrel and holding it by friction in the casing, a plunger in said last mentioned barrel, said plunger and seat being provided with fluid controlling valves, a tubular stem to which said plungers are attached and by means of which they may be simultaneously driven.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DAVID A. GARDEN.

Witnesses:

J. M. GARDEN, Lomsn CATHIEY. 

